/Engine/Plugins/Experimental/Mutable/Source/CustomizableObject/Classes/MuCO/CustomizableObject.h
Compute the number of files and sizes the BulkData will be split into and fix up HashToStreamableBlock's FileIndices and Offsets.
void PrepareBulkData ( [UCustomizableObject](API\Plugins\CustomizableObject\MuCO\UCustomizableObject) * InCustomizableObject, const [ITargetPlatform](API\Developer\TargetPlatform\Interfaces\ITargetPlatform) * TargetPlatform )